Blast-furnace.



No. 718,313. PATENTED JAN. 13, 1903. W. 0. GOFFIN.

BLAST FURNACE.

, APPLICATION FILED MAY 24, 1901.

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APPLICATION FILED MAY 24, 1901.

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UNITED STATES AT FFI WILLIAM C. OOFFIN, OF PITTSBURG, PENNSYLVANIA.

BLAST-FU RNAC E.

SPECIFICATION formingpart of Letters Patent No. 718,313, dated January13, 1903.

Serial No. 61,737. (No model.)

To all whom, it may concern:

Be it known that I, WILLIAM C. COFFIN, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inBlast-Furnaces, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to blast-furnaces,and more particularly to thewalls of the hearth, bosh, and stock-room; and the primary objectthereof is to so construct'said walls of metal as to relieve thebrickwork or lining of the weight or load, also of the internalpressure, and this without impairing the efficiency of the furnace orretarding expansion and contraction to which the furnace-walls arenecessarily subject.

The invention consists, primarily, of a vertical succession ofhorizontally-disposed wall members so arranged as to permit ofindependent expansion and contraction.

The invention consists,further, of a vertical succession of horizontalrings or bands spaced apart by interposed jackets for holding thecooling-plates, the rings, and jackets thus assembled, forming avertically-continuous outer wall, which may start at the furnacebase orat the base of the bosh.

In the accompanying drawings, Figure 1 is an elevation, partly insection, of the lower portion of a furnace constructed in accordancewith my invention. Fig. '2 is an enlarged vertical sectional View of aportion of the bosh-wall, and- Fig. 3 is a sectional plan view of thesame. Fig. 4 illustrates a portion of a furnace-wall of modifiedconstruction.

Referring to the drawings, and particularly to the construction shown inFig. l, the outer walls of the hearth, bush, and stock-room are formedof a vertical succession of horizontal rings or bands, which are spacedapart by the interposed cooling-plate jackets or holders 2. The rings orbands 3 of the hearth 4 are formed, preferably, of channel-bars, whilefor the bosh 5 the rings or bands 6 are formed of Z-bars. In continuingthe metallic wall above mantle 7 for stock-room 8 I preferably employchannel-bar rings 9, similar to rings 3 of the hearth. If desired, thisconstruction may be continuedto the top of the furnace.

-members, each consisting of a band or ring continuous around thefurnace and the cooling-plate jackets secured thereto and .with each ofsaid members capable of expansion and contraction independently of theother members.

In those portions of the furnace where the wall is vertical orsubstantially vertical the channel-bar rings are well adapted for thepurpose. For the upwardly-increasing diameter of the bosh the Z-barrings are preferably used, as the cross-sectional shape thereofconstitutes steps which conform to the inclination of the wall. Thechannel-bar rings may, however, be employed in forming the inclinedbosh-wall, as shown in Fig. 4. While I have here shown only channel andZ bar rings, the invention is in no sense limited .thereto, as bands ofany other desired crosssection may be employed.

In the preferred embodiment of my invention the metallic structure,consisting of the bands and series of jackets arranged alternately,begins at the furnace-foundation, and the same may be erected before anyof the lining or brickwork is put in place. As the life of thehearth-lining is materially prolonged by cooling, this constructionpermits of the introduction of cooling-plates into said wall. However,instead thereof the hearth may be inclosed by the vertical jacket 11,Fig. 4, provided at its upper end with the plate-ring 12, resting onbrackets 13, secured to the inner face of jacket 11, and the sectionalwall of bands and cooling plate-holding jackets may have its foundationthereon. As the improved outer metallic wall may be applied to theentire furnace or one or more parts only thereof, I do not limit myselfin this regard and desire the expression outer wall of a blast-furnaceoccurring in the claims read with this understandin The twyers may beintroduced through jackets 15, seated in the furnace-wall and overlappedby and riveted to the bands or rings 3 occurring in the plane thereof.

The jackets or holders 2 are slightly separated and formed with theparallel end surfaces 2, and in these intervening spaces a suit-ablegrouting 16 may be packed for preventing the escape of gases. Thecooling or bosh plates 17 may be of any preferred construction. Theopening in the back or vertical portion of each of jackets 2 ispreferably beveled or tapered on all of its edges, and the outer end ofthe plate 17 is similarly formed, so that when introduced into saidjacket-opening a very tight fit is effected. The plates are alwaysaccessible and may be easily inserted and removed.

A furnace-wall of the form here shown possesses all strength requisitefor resisting strains incident to internal pressure, and at the sametime, owing to the elasticity afforded by the unconnected wall members,the wall may contract and expand in amount sufficient to prevent injuryto any part of the structure. The metallic outer wall relieves therefractory lining and the cooling-plates embedded therein of much of theweight and accompanying crushing tendency to which they are ordinarilysubjected, as well as all strains laterally or radially.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. Outer-wall construction for blast-furnaces comprising horizontal wallmembers superposed and movable horizontally one upon the other, each ofsaid members consisting of a ring and spacing elements.

2. Outer-wall construction for blast-furnaces comprising horizontal wallmembers looselysuperposed and movable horizontally one upon the other,said outer Wall having cooling-plate openings, and cooling-plates forsaid openings.

3. Outer-wall construction for blast-fun naces comprising horizontalvertically-shallow wall members loosely superposed and movablehorizontally one upon the other, said outer wall having cooling-plateopenings, and cooling-plates for said openings.

4-. The outer wall of a blast-furnace formed of separated rings orbands,and cooling-plateholding devices interposed between the bands orrings, said bands and plate-holding devices being superposed one uponthe other and forming a vertically-continuous self-sustaining metallicwall.

5. The outer Wall ofa blast-furnace formed of a plurality of horizontalbands or rings and cooling-plate-holding devices interposed between thebands or rings, each of said devices being engaged by the bands or ringsimmediately above and below-the same and secured to one only of saidbands or rings.

6. The outer wall of a blast-furnace composed of a plurality ofhorizontal bands or rings having flat top and bottom surfaces, andcooling-plate-holding devices interposed between the bands or rings andformed with fiat top and bottom faces which engage the correspondingfaces of the adjacent rings or bands, thereby forming avertically-continuous metallic wall.

7. The outer wall of a blast-furnace formed of a plurality of horizontalbands or rings, of cooling-plate-holding devices interposed between andengaging adjacent rings or bands, thereby forming avertically-continuous metallic wall, and means for securing the saidholding devices to the bands or rings upon which they rest.

8. The outer wall of a blast-furnace bosh composed of a plurality ofhorizontal bands or rings of Z form in cross-section, andcoolingplate-holding devices interposed between adjacent rings andresting on the next adjacent under ring and supporting the ring nextabove.

9. In a blast-furnace, the combination of the hearth having an outerWall consisting of horizontal bands or rings formed of channelbars,cooling plate holding devices in ten posed between adjacent bands orrings, the bosh having an outer wall sustained by the outer wall of thehearth, the bosh outer Wall being formed of a plurality of bands orrings formed of Z-bars, and cooling-plate-holding devices interposedbetween adjacent Z-bar rings, thereby forming a continuous metallicouter wall for the hearth and bosh.

10. In a blast-furnace, the hearth and bosh constructed with avertically-continuous metallic outer wall, and the stock-roomconstructed with a vertically-continuous metallic outer wall, the saidouter walls of the bosh and stock-room being formed of disconnectedhorizontal members superposed one upon the other and capable ofindividual expansion and contraction.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM G. OOFFIN.

\Vitnesses:

J. M. NEsBIT, ALEX. S. MABoN.

